preclude vs rule out

preclude

verb
  • Remove the possibility of; rule out; prevent or exclude; to make impossible. 

rule out

verb
  • To reject an option from a list of possibilities. 

  • To disallow. 

  • To make something impossible. 

  • To cross an item out by drawing a straight line through it, as with a ruler. 

  • To make unavailable. 

How often have the words preclude and rule out occurred in a corpus of books? (source: Google Ngram Viewer )